If you think this is bad, you should see what your banks and financial organizations catalog for analytics.
Big Data is the new whizz-bang thing in the IT world. Your personal lives are being boiled down to numbers for multifaceted analytics on behavior, trends, creditworthiness, fraud, application use, and the list goes on.
Some of it isn’t bad, such as fraud detection, but if you think Facebook is the only game in town doing this stuff, you’re not paying attention.
I used to work for one of the big cell providers, working with their law enforcement relations department. They can travel back in time to get your location.
If you live in New York, but traveled to Montana four years ago and robbed a bank in a small town there, if you ever get on their radar, they can check your phone records and pinpoint the location of your phone at that particular time with ridiculous accuracy. You are busted.
In fact, if you have an android phone you can go to google and check your google account and pick any date in the past (that you had the phone and the account) and see a map of everywhere you went on any given day. It actually can be quite useful not only for prosecutors but, if you’re innocent, for you to support the argument that you were not at a particular place at a particular time. You can access the data with ease. Law enforcement needs a subpoena.